SQL Bug?

I'm far from an SQL expert, but...

select field1 from table1 where table2.field2 = table1.field3;

This query, which uses tables in the where clause that aren't in the list
of tables, actually does what one would sorta expect in PostgreSQL, but
isn't it a bug for it to do that?...

Not that I mind, since it's what I accidentally coded anyways.

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-- "TANSTAAFL" Rich lynch@lscorp.com